Patricia seen at a Hollywood benefit in 2015 (Image: Getty Images North America)

Patricia on The Tonight Show Starring Johnny Carson in 1962 (Image: NBCUniversal)

Since retiring from acting, Patricia devoted herself to her beloved painting.

She never married or had children, and had lived in the same apartment complex since 1961.

Tributes have started flooding in for the star.

American singer Michael Feinstein tweeted a picture of Patricia as a young actress, and wrote next to it: "It is with great sadness that I share that the beautiful Patricia Morison passed away peacefully this morning.

"She was one of the most talented performers of our time... and one of the most beautiful souls I’ve ever had the privilege of knowing. RIPPatriciaMorisonKissMeKate ."